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(No Model) W. S.- EATON & W. T. GOODNOW.

ENGR'AVING MACHINE.

mmwm mum MW .codwew Patented June 29,1897.

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WILLIAM S. EATON, OF SAG HARBOR, NEW YORK, AND WILLIAM T. GOOD- NOW, OFSAYRE, PENNSYLVANIA, ASSIGNORS TO THE EATON-ENGLE ENGRAVING MACHINECOMPANY, OF NEIV YORK, N. Y.

ENGRAVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 585,261, dated June 29,1897. Application filed November 27, 1896. Serial No. 618,634. (Nomodel.)

To ctZZ whom it may concern.-

Be it known that we, WILLIAM S. EATON, residing at Sag Harbor, in thecounty of Suffolk and State of New York, and WVILLIAM T. GOODNOW,residing at Sayre, in the county of Bradford and State of Pennsylvania,citizens of the United States, have invented certain new and usefulImprovements in Engraving-Machines, of which the following is aspecification.

Our invention relates to improvements in engraving-machines of the typeshown in Letters Patent granted to Stephen D. Engle September 6, 1881,No. 246,737, and April 10,

1883, No. 275,618, and has for its objects to provide the above machinewith mechanism whereby the pressure upon the graving-tool both forcutting and shading may be more accurately and evenly controlled, toprovide '20 the bracket which supports the work with means for tiltingit forward in order that the work may be brought down within the visionof the operator for examination, and, finally,

to so arrange and construct the graving-tool and its holder that copperplates, 850., may be engraved in reverse for printing and like purposes.WVe attain these objects by the mechanisms illustrated in theaccompanying drawings, in which Figure 1 is a perspective view of thecomplete machine; Fig. 2, a front elevation of the upper portion,showing pressure-regulator and bracket; Fig. 3, a side view of the same;Figs. 4 and 5, details showing a modified form 3 5 of thepressure-regulator; Figs. 6 and 7, de-

- tails of the tool arm and holder, and Fig. 8

top and sectional views of the bracket.

Similar letters refer to similar parts throughout the several views.

Ais the main standard of the machine,upon the front of which isadjustably clamped the bracket 13, carrying a table having forward andside adjustments, to which table appropriate chucks or clamps forholding the work 45 are to be attached.

0 is the pantograph-arm, suspended by a gimbal at D from the top of thestandard A and fitted at its lower extremity with a pivoted arm E, whichcarries the tracer e.

F is the tool-arm, pivoted to the clamp c, which is adjustablevertically in the upper portion of the pantograph-arm C. Upon theforward end of the tool-arm, in the fork f, is pivoted the tool-holderG, provided with a lateral arm 6, which is held at its outer end by aball-and-socket joint to the adjustable upright H, which in turn is heldto the base of the machine by a ball-and-socket joint. This latterarrangement causes the gravingtool to be carried across the work in anap- 6o proximately-vertical position at all times. These parts aresubstantially the same as shown in the two Letters Patent abovementioned.

In front of and close to the yoke in the standard A is the support I,held transversely beneath the tool-arm 011 the post 1' which can bevertically adjusted in a socket a, attached to the standard in asuitable position. The support I is bent up at the ends, and jour- 7onaled therein is a small shaft J. At one end of this shaft is an arm j,from which a chain 0 depends, a wire provided with a ring at its lowerextremity being hooked into suitable links of this chain to bring thering within reach of the operator, according to the adj ustment ofsupport I. Between the journals on the shaft is keyed a blade orcrossbar K, to the top ends of which is fastened a parallel bar L. Thetool-arm F extends outward from between the bars K and L. Springs 7t 7t,coiled about the shaft J and having ends attached to pins projectingfrom support I, press the bar K into an upright position, the stop 7tbeing provided to strike one of the pins and prevent the bar from beingthrown over backward.

In operation the tool-arm is first set in position to reproduce thedesign at the desired reduction by properly adjusting the clamp 0 0 andthe post 2', and the work is then brought up to within a short distanceof the engraving-tool by a proper adjustment of the bracket B. Theoperator takes the tracer in his right hand and causes its point tofollow the lines 5 of the design, at the same time with his left 'handpulling down 011 the chain 0 and causing the shaft J to turn forward.The chain 0 may also run down beneath the table and be operated by thefoot. This turning of the shaft-tilts the bar K forward and allows thetool to drop upon the work. A further turning of the shaft brings thebar L down on the top of the tool-arm, and the pressure of this bar uponthe tool-arm determines the depth of cut made by the tool. By varyingthe pull on the chain 0 the operator changes the depth of out to suitthe requirements for shading, &c. To remove the tool from the work, inorder to begin a new line, &c., the chain is released, allowing thesprings 7c to press the bar K back to vertical position, which lifts thetool-arm and raises the tool. The edges of the bars K and L beinghorizontal or parallel with the work-table the tool is forced to move inan approximately horizontal plane as it goes from side to side, so thatgiven a constant pressure on the bar L the tool will cut to the samedepth in its extreme positions as in its central one, since bar L willbe forced upward slightly to compensate for the tendency of the tool tocut deeper when the tool-arm swings out from its central position.

Herein lies our improvement over the prior machines. In these oldmachines the cuttingpressure is exerted by pressing on the trigger onthe tracer-arm with a finger of the hand which guides the tracer. Whenthe tracerarm is in extreme positions, the relative dropping of the endof the arm increases the angle which it makes with pantograph-arm O andcauses the pressure on the trigger to exert a stronger push on thetool-arm than when the tracer is in a central position. This causes thetool to cut in deeper at corresponding positions of the tool-arm, beingmore apparent when the design is being cut at a greatly-reduced scale.Vith our improvement the pressure is unaffected by the position of thetracer-arm and is controlled entirely by the left hand, the right beingemployed solely to move the tracer. In this way the operator has but onehand to think of in regulating the pressure, while in the old machineshe was obliged to bear in mind both hands.

The form of our pressure-regulator just described has one objectionablefeature, which is, that tilting forward the bars K L causes the verticalspace between them to grow narrower until the tool-arm becomes pinchedbetween them. The vertical movement in the tool-arm, is thus somewhatlimited. To avoid this and give a greater range of motion to thetool-arm, we have devised the modification shown in Figs. 4 and 5. Herethe support I is provided with bifurcated ends within which the bars Kand L are guided in a vertical plane. Two parallel links m m support thebars and cause them to retain a horizontal position throughout theirvertical motions. A spring at presses upward on the underside of K. Fig.5 is an end view with one of the bifurcations broken away to show howthe parallel links are coupled to bar K. It will be evident that a pullon the chain 0 causes the bars K and L to move downward and sidewise,the horizontal space between the bars being of such a length that thissidewise movement will not reduce the lateral play of the tool-arm.

In Figs. 6 and 7 is shown an improved man ner of arranging the tool armand holder. The yoke f liesin a horizontal position and the tool-holderis pivoted therein, as shown, and has the hole which received the toolextended clear through it A tool may thus be held in it, point upward,and an engraving cut in reverse 011 a plate held in a suitable chuckabove the tool. The set-screw g holds the tool in place in eitherposition. The toolarm has its top and bottom sides rounded off in orderthat the arm, when tilted by the lateral swing of the pantograph-arm,will not be raised or lowered when in contact with the bars K or L.

Since the operator sits with the pattern he is tracing before him withinconvenient reach of his hands and eyes, the work is necessarily abovehis line of vision and he must rise in order to inspect it. To avoidthis and bring the work out from under the graving-tool for betterinspection, we construct the table so that it may be swung forward, asindicated in Fig. 3. A plate Z) is made to fit the slot in the standardA, and is held in proper posi-..

tion by the clamping-bolt 1). At the foot of plate 1) small bracketsb 1) project, and just above them is held by pivot-screws r r the lowerend of bracket B, which is forked in the manner shown. The sides ofbracket I3 are not connected at the back except by the narrow strip to,just above which in plate I) is a clamping-button .9. By giving thisbutton a half-turn the projection i is brought above a, and the bracketmay then be swung forward and allowed, if desired, to rest on the smallbrackets 19 b. The threads on .9 cause the projection 25, when turneddown, to be drawn tightly against strip a, and thus hold the bracket Bfirmly against plate I).

We do not Wish to confine ourselves to the exact arrangement andconstruction of parts as herein described, as it is evident that variouschanges may be made in particular details without departing from thespirit of our invention.

The machine as above constructed is very simple and can be held undercomplete control by the-operator. A large range of work can be done veryquickly and with a high degree of precision and perfection. It isespecially adapted for engraving monograms, crests, coats of arms,copper plates for printing, the.

XV hat we claim as our invention, and desire to-secure by LettersPatent, is-

1. In a pantograph engraving-machine the combination of a tool-arm adjustablyattached to the pantograph-arm, a support adapted to follow theadjustment of the tool-arm, a bar held by the support transverselybeneath the tool-arm, and means for raising and low ering the bar in thesupport substantially as described and for the purpose set forth.

2. In a pantograph engraving-machine the combination of a tool-arm adjustably attached to the pantograph-arm, a support adapted to follow theadjustment of the tool-arm, a bar held by the support transversely abovethe tool-arm, and means for raising and lowering the bar in the supportsubstantially as described and for the purpose set forth.

3. In an engraving-machine, the combination with the tool-arm, of twoparallel bars transversely disposed with relation to the tool-arm, theone below and the other above the arm, an adjustable support therefor,and means for raising and lowering the bars substantially as describedand for the purpose set forth.

4. In an engravingmachine, the combination, with the tool-arm, of twoparallel bars transversely disposed thereto, the one below and the otherabove the arm, rigid connections between the bars, an adjustable supporttherefor, Vertical guides for the bars on the support, parallel linksconnecting the bars with the support, a spring exerting an upwardpressure on the bars, and a chain or cord attached to the end of one ofthe bars, substantially as described and for the pur pose set forth.

5. In an engraving-machine, the combination of a tool-arm provided atits end with a horizontal yoke, a tool-holder pivoted in the yoke, adouble socket in the holder whereby the graving-tool may be held withits point up or down, a clamping-screw for holding the tool in place, anarm extending laterally outward from the tool-holder, and an adjustableupright connected to the arm and to the base of the machine by swiveledjoints.

6. In an engraving-machine, the combination, with the standard, of aplate adapted to slide vertically on the standard and to be held inproper adjustment thereon, a Worktable so hinged to the plate as to bedropped down to a vertical position for inspecting the work, and a clampon the plate for securing the Work-table in its normal horizontalposition, substantially as described.

In testimony whereof we have affixed our signatures in presence of twowitnesses.

WILLIAM S. EATON. [L. s] WILLIAM T. GOODNOW.

Witnesses as to signature of William S. Eaton:

FRANK B. GLovER, JAs. G. COOPER.

Witnesses as to signature of William T. Goodnow:

GEO. I-I. MAURICE, Trros. W. DOWNING.

